Shown above is a diagram of how the 27, wires in a cable were grouped together and then tightly compressed into their final form by a hydraulic press. Traffic jams are rare on the Bridge because the Bridge District added ferry and bus transit service. Annually, 40 million vehicles cross the Bridge; two-and-one-half million passengers are transported by the ferries; and over 6 million passengers ride the buses. Skip to Main Content. How big is the main cable?
Top of Page. Despite the ongoing hazardous conditions faced by the crew, the construction produced just one casualty through four years. However, the near-spotless safety record was blemished when a scaffold fell and tore through the net in February , resulting in the deaths of 10 workers. The roadway was completed on April 19, , and the bridge officially opened to pedestrians on May 27 of that year.
The following day, President Franklin D. Roosevelt announced that the bridge was open to cars and the rest of the world via White House telegraph.
A marvel of modern engineering, the Golden Gate Bridge is 1. Its 4,foot main span between the two towers was the longest for a suspension bridge until , while its foot towers made it the tallest bridge of any type until The Golden Gate Bridge withstood the destructive Loma Prieta earthquake of , and was closed to traffic only three times in its first 75 years due to weather conditions.
Believed to be the most photographed bridge in the world, this landmark was named one of the seven civil engineering wonders of the United States by the American Society of Civil Engineers in But if you see something that doesn't look right, click here to contact us! Subscribe for fascinating stories connecting the past to the present. Since , its granite towers and steel cables have offered a safe and scenic passage to millions of commuters and tourists, trains and bicycles, The 1.
At its completion in , the suspension bridge was considered an engineering marvel—the longest main suspension bridge span in the The military wanted the Golden Gate Bridge to be painted in stripes. The U. War Department initially objected to the construction of the Golden Gate Bridge because it feared that Navy ships could be trapped in San Francisco Bay if the span was bombed or collapsed.
The military The victory ended British authority in North Carolina and provided an important boost to Patriot morale. Proper functioning of the tie-downs depends on the clamping force of the cable bands, which in turn is dependent on adequate cable band bolt tension.
Bolts that had corroded over time were replaced. This project was completed by District crews. The Golden Gate Bridge has pairs of vertical suspender ropes that are spaced 50 feet apart across both sides of the Bridge. All of the ropes were replaced between and , with the last rope replacement completed on May 4, These are the quantities when the bridge was built After the original concrete roadway deck was replaced, the amount of concrete is now LESS than when the Bridge was built by 25, cubic yards.
Skip to Main Content. Length, Width, Height, Weight Total length of Bridge including approaches from abutment to abutment is 1. Length of one side span is 1, ft m. Width of Bridge is 90 ft 27 m.
Width of roadway between curbs is 62 ft 19 m. Width of sidewalk is 10 ft 3 m. Clearance above mean higher high water is ft 67 m. Total weight of each anchorage is 60, tons 54,, kg. The maximum transverse deflection, at center span is Live load capacity per lineal foot is 4, lbs 1, As an example of how the Bridge is built to move, during the winter storms in , the main span bowed approximately 6 to 7 feet The three maximum deflections noted above at the center of the suspension bridge are due to the following loading conditions: The transverse deflection is due to a sustained transverse wind load.
The maximum transverse movement of The height of a tower above water is ft m. The height of a tower above roadway is ft m. Tower base dimension each leg is 33 ft x 54 ft 10 m x 16 m.
0コメント